DE202019105323U1 - Filter element for use in a filter and filter with a filter element - Google Patents

Abstract

Filter element (2), in particular exchangeable filter element, in particular for separating particles and / or gases and / or liquids, in particular a filter cartridge, for use in a filter, in particular a compressed air filter, in particular as part of a filter 45 with several filter stages, comprising an im Essentially tubular body (27) with an annular end face (21) facing a filter head (3), an underside (28) spaced from the end face (21) and facing away from the filter head (3), a peripheral surface (29) ), which extends along a central axis (18), in particular an axis of rotation,
- wherein the peripheral surface (29) connects the end face (21) and the underside (28) to one another,
- several, preferably four, holding arms (30) extending radially to the central axis (18) are provided in the area of the end face (21),
- An annular, in particular circular, filter element sealing surface (6) being provided on the end face (21), characterized in that the holding arms (30) protrude with respect to the filter element sealing surface (6).

Description

The invention relates to a filter element, in particular a replaceable filter element, in particular for separating particles and / or gases and / or liquids, in particular a filter cartridge, for use in a filter, in particular a compressed air filter, in particular as part of a filter with several filter stages. The filter element comprises a substantially tubular body with an annular end face facing a filter head, an underside spaced from the end face and facing away from the filter head, a circumferential surface extending along a central axis, in particular an axis of rotation, wherein the Circumferential surface connects the face and the bottom. In the area of the end face, several, preferably four, holding arms extending radially to the central axis are provided, with an annular filter element sealing surface likewise being provided on the end face.

The invention also relates to a filter with such a filter element.

Filter elements are usually used for the filtration of flowable media within a filter. Such media can for example be gases but also liquids such as water or fuel or the like. The medium to be filtered flows through the filter elements, with impurities being separated out. Such a filter element usually has a body in which there is a filter medium that is flowed through. As a rule, a filter head is provided through which the fluid to be filtered is fed in and the filtered fluid is discharged. Comparable filter elements also have fastening devices with which the filter elements can be fastened relative to the filter head in order to seal the filter head via a sealing body. For this purpose, the filter element can be screwed directly to the filter head, for example. Another type of attachment is via a filter sleeve or a filter bowl, the filter element being inserted into the filter sleeve and resting on the closed end of the filter sleeve. The closed end of the filter cartridge forms an abutment for the filter head, the filter element being braced between the filter head and the abutment.

A filter element mentioned at the beginning is from US 2007/0095744 A1 known. This is a fluid filter with an exchangeable filter cartridge with a tubular body, a closed end and an annular open end face. Furthermore, retaining arms are provided which lie in recesses in the open side of the filter sleeve, the retaining arms projecting back from the filter element sealing surface on which the filter element seals towards the filter head.

The invention is based on the object of providing a filter element with structurally improved holders.

This object is achieved by the filter element according to claim 1.

The dependent claims relate to advantageous configurations.

A filter element according to the invention can be designed as an exchangeable filter element, in particular for separating particles and / or gases and / or liquids, in particular in the form of a filter cartridge, for use in a filter.

The filter element comprises an essentially tubular body, with an annular end face which faces a filter head. Furthermore, an underside is provided which is spaced apart from the end face and faces away from the filter head.

The filter element also has a circumferential surface which extends along a central axis, in particular an axis of rotation, and connects the end face and the underside with one another. In the area of the end face, several, preferably four, holding arms extending radially to the central axis are provided. The (circular) ring-shaped filter element sealing surface is provided on the end face, with the holding arms protruding from the filter element sealing surface. The holding arms serve to position the filter element and to hold the filter cartridge, and thus clearly define the position of the filter cartridge in relation to the filter head. This makes it possible for the filter element, as previously structurally defined, to flow against it.

Thanks to the holding arms protruding from the filter element sealing surface, there is a favorable introduction of force. Furthermore, the protruding holding arms protect the filter element sealing surface from damage during transport or during handling / assembly of the filter element. In addition, material accumulation during production can be prevented.

If a clear rotational position is desired, at least one of the holding arms can be designed differently from the other holding arms, which then engages in a corresponding receiving device on the filter cartridge.

The holding arms can be substantially L-shaped in cross section. The retaining arms can also be positioned opposite the filter element sealing surface in Project outwards in the radial direction. It can also be advantageous if the holding arms protrude radially outward on the circumferential surface. A particularly advantageous fastening of the filter element to the filter head can be provided by holding arms designed in this way.

The holding arms are preferably firmly connected to the filter element sealing surface, preferably formed in one piece with the filter element sealing surface. This makes it possible to define the position of the holding arms in relation to the filter element sealing surface, which ultimately enables the filter element to be optimally positioned in relation to the rest of the filter.

It is particularly advantageous if the holding arms each have a support surface which points in the opposite direction of the filter element sealing surface, preferably with the support surface being convexly curved. The convex curvature of the support surface runs in the axial direction, the support surfaces adjoining the free ends of the holding arms and having a length of at least 3 millimeters and a maximum of 10 millimeters in the radial direction. This enables a particularly advantageous transmission of force between the holding arms and the filter element sealing surface. Furthermore, the holding arms can be accommodated in a corresponding recess.

In addition, centering ramps can be provided at the transition between the holding arms and the peripheral surface. The centering ramps go here at an angle between 70 ° and 5 °, preferably between 20 ° and 40 °, to the central axis from the circumferential surface in the direction of the holding arms. Here, the centering ramps connect the circumferential surface and the support surfaces to one another. The positioning of the filter element relative to the filter head and in the filter sleeve is facilitated by the centering ramps or centered in the filter sleeve and kept at a distance from it.

The holding arms can also have an end surface which is located at the exposed end of the holding arms which faces away from the peripheral surface in the radial direction. The distance between the center of the filter element sealing surface and the end surface in the radial direction is preferably between 12 and 18 millimeters, the distance from the center of the filter element sealing surface can also be between 14 and 16 millimeters. The smallest distance between the filter element sealing surface and the support surfaces in the axial direction is between 0 and 4 millimeters, preferably between 1 and 2 millimeters. The greatest distance between the filter element sealing surface and the support surfaces is between 4 and 6 millimeters. This dimensioning of the holding arms ensures a particularly stable fit of the holding arms in a corresponding recess. Furthermore, the end faces serve as a grip area for removing the filter elements from the surrounding filter sleeve and thus make it easier to change the filter elements.

Furthermore, the filter element can be designed in such a way that essentially only axial forces act on the filter element sealing surface, preferably with the holding arms forming an abutment against the axial forces. Here, the axial forces are created by the compression of the sealing body, which rests on the filter element sealing surface. The holding arms can be flexible in the axial direction and serve as a compensating element between the sealing body and the receiving devices for the holding arms.

In addition, the sealing body rests against the (circular) annular filter element sealing surface of the filter element in such a way that the sealing body separates an outer space, which is located outside the filter element, from an inner space, which is located inside the filter element, between the filter head and the filter element. This results in the separation of a clean gas space from a raw gas space and a particularly advantageous connection between the filter element and the filter head is created.

As a further design feature, a substantially tubular filter sleeve with an open filter sleeve end face facing the filter head and a filter sleeve outside running along the jacket surface can be provided, preferably with the filter sleeve surrounding the filter element and delimiting it from the surroundings. In addition, the filter sleeve face can have receiving devices for the holding arms, the filter element only being in contact with the filter sleeve via the holding arms arranged in the receiving devices and otherwise being designed to be freely suspended in the filter sleeve. Such a connection between the filter head, filter cartridge and filter sleeve can be implemented with particularly few additional parts and via simple geometries and therefore particularly inexpensively.

The receiving devices can be formed at least by continuous incisions which begin at the filter sleeve end face and run radially to the central axis; the receiving devices preferably receive the holding arms. Among other things, the ends of the incisions can form abutments that are concave in shape to match the convex support surfaces of the holding arms. Here, the abutments absorb the forces that result from the compression and the pressure load on the sealing body. This interaction between receiving devices and holding arms makes positioning of the Filter element allows, at the same time a compensation for dimensional deviations is created in addition to the sealing body.

The sealing body can be an axially acting seal. In addition, the filter sleeve can seal against the filter head by means of a radial seal. In order to form a closed space around the filter element, the filter sleeve can be designed in the form of a pot and accordingly closed at the end facing away from the filter head. On the one hand, this form of seal enables simple assembly of the filter cartridge and, on the other hand, can be implemented in a particularly space-saving manner.

At least two of the receiving devices can be designed as receiving locking devices, which are used to receive the holding arms and to receive retaining bolts. These retaining bolts are preferably attached to the filter head and can be aligned radially to the central axis.

The receiving locking devices are advantageously designed in such a way that the retaining bolts interact with the receiving locking devices in the manner of a bayonet lock. Such a configuration enables the filter element to be changed particularly easily, while at the same time enabling sufficient axial movement for bracing the sealing body.

For the implementation of the bayonet lock, the receiving locking devices can have, in addition to the axial incisions of the receiving devices, a fastening extension, which is preferably formed by a further incision which extends from the axial incisions and runs essentially in the circumferential direction around parts of the filter sleeve. In addition, the fastening extension can have a snap-in undercut which is formed by an indentation on the filter head side in the end region of the fastening extension. A bayonet lock designed in this way is particularly inexpensive to manufacture and enables the filter sleeve to be fastened particularly securely to the filter head, which is secured by the snap-in undercut when pressure is applied to the filter.

Another embodiment relates to a filter with at least two filter stages. The filter elements have different filter properties, for example. The sealing arrangements for sealing between the filter elements and the filter heads are preferably designed essentially identically. Additionally or alternatively, the receiving devices of the filter sleeves and the holding arms of the filter elements can be designed essentially identically.

In such a filter, both the seals between the filter element and the filter head, as well as the sealing surfaces on the filter element side and the sealing surfaces on the filter head side, the receiving devices of the filter sleeves or the retaining arms of the filter elements of the different filter stages can be designed identically.

Such a filter element or the sealing arrangement between the filter element and the filter head is designed so that the filter element or the sealing arrangement can be subjected to higher pressure from the outside than from the inside. Preferably at least one of the filter elements or one of the sealing arrangements of the entire filter is inversely pressurized. This allows a uniform structure for the different filter stages to be provided. Furthermore, with this structure, the filter elements can be loaded or flowed through both from the outside to the inside and from the inside to the outside. Preferably, one of the filter elements is flowed through in the radial direction from the inside to the outside and another filter element from the outside to the inside, that is to say towards the central axis.

Such a sealing arrangement can be used in particular in the area of compressed air filters, for example as part of a filter with a plurality of filter stages, for a fluid-tight seal between a filter element and a filter head. Such a filter element is preferably a filter cartridge.

This sealing arrangement comprises an annular elastic sealing body, a filter head and filter element sealing surface. The sealing body has a filter head side facing the filter head sealing surface, an opposite filter element side facing the filter element sealing surface, an inner surface encircling the inside and an opposing outer surface encircling the jacket surface. The filter head side comprises a circumferential first indentation between the inner surface and the outer surface, the filter element side having a circumferential second indentation between the inner surface and the outer surface. The filter head side rests, at least in some areas, circumferentially on the filter head sealing surface, the filter element side in at least in some areas in circumferential contact with the filter element sealing surface. The filter head sealing surface and the filter element sealing surface consist at least of a circumferential inner partial surface and a circumferential outer partial surface.

The partial areas of the filter head sealing area and the partial areas of the Filter element sealing surface towards the center between the partial surfaces in such a way that the distance between the inner partial surfaces from the inside to the outside and the distance between the outer partial surfaces from the outside inward, essentially in the direction of the central axis of the sealing body, decreases. The partial surfaces interact with the indentations in such a way that the sealing body wedges between the inner partial surfaces and / or the outer partial surfaces when pressure is applied from the inner surface and / or the outer surface, in the direction of the acting force.

The partial surfaces increasing towards the center create a central constriction between the filter head sealing surface and the filter element sealing surface, which widens outward on both sides from the center between the two partial surfaces. This constriction interacts with a corresponding tapering of the sealing body. If pressure is applied to the sealing body from the inner surface or the outer surface, it is pressed against the inclined flanks of the constriction, which are on the side of the force. The sealing body is so inflexible here that, when used as intended, it cannot be compressed so strongly by the application of pressure that the sealing body is pressed through the constriction in the direction of the action of the force.

The fact that the sealing body is pressed into the constriction results in wedging or greater compression of the sealing body between the opposite sealing surfaces, which in turn leads to an increase in the sealing effect. This results both from a resulting application of pressure on the part of the outer peripheral surface and on the part of the inner peripheral surface.

The sealing effect increases automatically with increasing load from the inner surface or the outer surface.

In particular, the sealing seat between the partial surfaces and the indentations is reinforced by the interaction between the acting force and the wedge effect in the event of a pressure difference between the inner surface and the outer surface. If a pressure difference on the inner or outer surface of the sealing body exerts a greater pressure on the sealing body than on the opposite surface, the sealing body is pressed in the direction of the acting force, the space between the partial surfaces being reduced in this direction. The wedge effect results from the interaction between the acting force and the narrowing between the filter head sealing surface and the filter element sealing surface. Due to the wedge effect, the seal is pressed more strongly against these partial surfaces, whereby the sealing effect increases with increasing pressure difference.

In addition, the ramp-like design makes it easier to position the seal or the filter element in relation to the filter head.

It is particularly advantageous if the sealing body has a circumferential retaining groove on the filter head side for receiving a retaining element. In particular, the holding element is designed in such a way that, in cooperation with the holding groove, a releasable latching connection is created, the latching connection holding the filter head side of the sealing body in contact with the filter head sealing surface. The retaining groove runs in the area of the indentation, preferably in the base of the first indentation. The holding element protrudes between the two partial surfaces of the filter head sealing surface. The retaining element preferably projects along a circular ring opposite the filter head sealing surface. The sealing body can be reliably held on the filter head by means of such a latching connection, with replacement of the sealing body, for example in the event of damage, being particularly facilitated.

It is also particularly advantageous if the second indentation extends at least over half, preferably more than two thirds of the width of the filter element side, between the inner surface and the outer surface. In addition, the first indentation can also extend at least over half, preferably more than two thirds of the width of the filter head side between the inner surface and the outer surface. A particularly good sealing seat can be ensured by such a configuration, since two almost linear sealing surfaces are created and thus a susceptible surface pressure is prevented.

It is therefore also particularly advantageous if the sealing body does not bear against the filter element sealing surface in a circumferential partial area of the second indentation, preferably in the area of the lowest point of the second indentation. It is particularly advantageous if the sealing body does not bear against the sealing body in the area which is closest to the filter head sealing surface, at least in some areas. In this way, a first external and a second internal sealing surface can be created which have similar sealing properties, whereby a comparable load-bearing capacity of the seal on both sides is ensured.

The holding element and the holding groove can be designed in such a way that there is a sealing seat between the base of the holding groove and the region of the holding element which is closest to the filter element sealing surface. This is preferably achieved in that the depth of the retaining groove in the axial direction in the non-assembled state of the sealing body is smaller than the height of the retaining element in FIG Axial direction is. This makes it possible to produce an annular seal with a small area, which seals fluid-tight even when the sealing body is slightly pressed.

The locking connection can be formed by a one-sided extension on the holding element and a corresponding recess in the sealing body, the extension protruding outward in the radial direction to a central axis of the sealing body. Here, the opposite side of the holding element has no bulge and is flat in the direction of the central axis. Thus, the holding element is L-shaped in cross section in the west. A holding element designed in this way ensures that the service life of the sealing body is maximized, since the holding groove is only subjected to external loading.

It is particularly advantageous if the sealing body has a hardness between 60 Shore A and 90 Shore A, preferably between 60 Shore A and 80 Shore A, particularly preferably 70 Shore A. This ensures that the sealing body is elastic enough for a sufficient seal between the sealing surfaces and at the same time is rigid enough to ensure the wedge effect to the required extent.

It is also advantageous if partial surfaces of the filter head sealing surface and / or the filter element sealing surface have an internal angle α of less than 180 °, preferably between 130 ° and 170 °, to one another in the radial direction to the central axis. A particularly advantageous range is between 145 ° and 155 °. A particularly advantageous distribution of the acting forces and the creation of the wedge effect can be ensured by these angles.

It is also particularly advantageous if the filter head side of the sealing body has two circular, circumferential sealing partial surfaces between which the retaining groove extends into the sealing body and both sealing partial surfaces in the radial direction to the central axis at an external angle α ₁ less than 180 °, preferably between 125 ° and 175 ° . A particularly advantageous range here is between 140 ° and 150 °. This ensures an optimal interaction between the sealing surfaces on the filter head side and the partial sealing surfaces on the filter head side of the sealing body, and thus a high sealing effect and the creation of the wedge effect.

It is also advantageous if the second indentation has a greater depth in the direction of the central axis in the non-assembled state than the height offset of the partial areas. The vertical offset of the partial surface is to be understood here as the distance to which the partial surfaces extend in the axial direction opposite to the filter head. The height of the partial areas is preferably less than 70% of the depth of the second indentation. The greater depth of the second indentation provides a clearance between the filter head sealing surface and the filter element sealing surface, which compensates for inaccuracies in the positioning of the two surfaces with respect to one another.

In a further particularly preferred exemplary embodiment, the sealing arrangement is designed for use in a filter, the filter element of which is attached to the filter head along an assembly axis which runs parallel to or identical to the central axis of the sealing body. This enables particularly simple assembly and disassembly of the filter element.

A filter head of a corresponding filter preferably has a hollow cylindrical filter sleeve end face recess, which extends from the side of the end face and essentially axially symmetrically to the central axis of the filter element into the filter head and receives the filter sleeve end face. Here, the filter sleeve face recess is located in the radial direction to the central axis outside of the filter head sealing surface. This enables a particularly compact design.

Furthermore, a corresponding filter head can have two retaining bolt bores extending radially to the central axis, which are preferably opposite one another, the retaining bolt bores receiving retaining bolts which are part of the bayonet lock. A metal-to-metal conical seal is preferably provided between the retaining bolt and the filter head for sealing off from the environment. This design enables particularly simple and inexpensive manufacture.

It can also be particularly advantageous if the sealing arrangement is designed in such a way that the inner surface and outer surface of the sealing body do not come into contact with either the filter head or the filter element side. Accordingly, the sealing body seals against the filter head sealing surface and the filter element sealing surface essentially only by means of axially acting forces. Such an axially sealing seal also enables particularly simple assembly and disassembly of the filter element, since a significantly smaller path in the axial direction is necessary in order to achieve an adequate sealing effect.

Insofar as this is relevant for the corresponding explanation, the above explanations basically assume the installed state of the filter element with a compressed sealing body. In this state, the sealing body seals between an interior and an exterior. In the event that a version refers to the dismantled state with the unpressed sealing body, this was explicitly mentioned.

A filter according to the invention can only have the main features as well as any combination of the further features described. Furthermore, the various features of the exemplary embodiments, including various exemplary embodiments, can be combined with one another as desired. Apart from that, the invention relates to both a filter with a described filter element and a filter with a described sealing arrangement as well as the sealing arrangement and the filter element per se, or any combination of filter element and sealing arrangement.

• 1 einen Ausschnitt einer Schnittansicht einer Filterstufe mit einer Dichtungsanordnung und einem Filterelement,
• 2 einen Ausschnitt einer Schnittansicht einer Dichtungsanordnung,
• 3 einen vergrößerten Ausschnitt einer Schnittansicht einer Dichtungsanordnung,
• 4 ein Krafteinwirkungsdiagramm eines axial und umfangsseitig belasteten Dichtkörpers,
• 5 eine perspektivische Ansicht eines Filterelements,
• 6 eine perspektivische Ansicht einer Filterhülse mit einem Filterelement,
• 7 einen Teilschnitt einer Unteransicht eines Filterkopfes und
• 8 eine Seitenansicht eines mehrstufigen Filters.

The invention is explained below with reference to the figures described. The figures show:

• 1 a detail of a sectional view of a filter stage with a sealing arrangement and a filter element,
• 2 a detail of a sectional view of a sealing arrangement,
• 3 an enlarged detail of a sectional view of a sealing arrangement,
• 4th a force action diagram of an axially and circumferentially loaded sealing body,
• 5 a perspective view of a filter element,
• 6th a perspective view of a filter sleeve with a filter element,
• 7th a partial section of a bottom view of a filter head and
• 8th a side view of a multi-stage filter.

In 1 and 2 is a sealing arrangement 1 for a filter, in particular a compressed air filter, in particular as part of a filter with several filter stages 45 , for a fluid-tight seal between a filter element 2 , in particular a filter cartridge, and a filter head 3 shown. Next is an annular, elastic sealing body 4th and a filter head and filter element sealing surface 5 , 6th shown.

The sealing body 4th has one of the filter head sealing surfaces 5 facing filter head side 7th , an opposite, the filter element sealing surface 6th facing filter element side 8th , an inner surface running around the inside 9 and an opposite outer surface running around the jacket surface 10 on. The filter head side 7th has a circumferential first indentation 11 between inner surface 9 and exterior surface 10 on, being the filter element side 8th also a circumferential second indentation 12 between inner surface 9 and exterior surface 10 having.

The filter head sealing surface 5 and the filter element sealing surface 6th consist of at least one circumferential inner partial surface 13 and a circumferential outer partial surface 14th . From the drawings it can be seen that the filter head side 7th , at least in some areas, around the filter head sealing surface 5 and the filter element side 8th , at least in some areas, circumferentially on the filter element sealing surface 6th is applied. Here the partial areas increase 13 , 14th the filter head sealing surface 5 and the partial areas 13 , 14th the filter element sealing surface 6th to the middle between the partial areas 13 , 14th in such a way that the distance between the inner partial surfaces 13 to each other from the inside to the outside and the distance between the outer partial surfaces 14th from the outside to the inside, in the axial direction to the central axis 18th down, decreases. It can also be seen that the inner surface 9 and exterior surface 10 of the sealing body 4th neither on the filter head nor on the filter element side come into contact and accordingly only axially to the central axis 18th seal.

There is also a radial seal 46 shown having the filter between the filter head 3 and the filter sleeve 33 to the environment or to the surrounding atmosphere. With this seal 46 it is a seal 46 which are essentially about radial to the central axis 18th acting forces seals.

How out 1 and 2 can also be seen, the partial areas are effective 13 , 14th such with the indentations 11 , 12 together that the sealing body 4th , when pressurized, from the inner surface 9 and / or the outer surface 10 from, in the direction of the acting force F ₁ , F ₂ , between the inner partial surfaces 13 and / or the outer partial surfaces 14th wedged. This wedge effect creates the sealing seat between the partial surfaces 13 , 14th and the indentations 11 , 12 reinforced, the force F ₁ , F ₂ only when there is a pressure difference between the inner surface 9 and exterior surface 10 arises. In 4th shows the forces acting on the sealing surfaces 5 , 6th act when the seal assembly 1 external surface F _{1 is} loaded.

How out 1 It can also be seen is the sealing arrangement 1 designed for use in a filter, the assembly of the filter element 2 to the filter head 3 takes place along a mounting axis that is identical to the central axis 18th of the sealing body 4th runs.

The sealing body 4th lies on the annular filter element sealing surface 6th of the filter element 2 and separates an outside space 31 that is outside the filter element 2 located, from an interior 32 located inside the filter element 2 located between the filter head 3 and filter element 2 from each other.

In 3 it is shown that the sealing body 4th on the filter head side 7th a circumferential retaining groove 15th for receiving a holding element 16 having. The holding element 16 is designed in such a way that it interacts with the retaining groove 15th , a releasable locking connection 17th arises. The locking connection 17th holds the filter head side 7th in attachment to the filter head sealing surface 5 , with the retaining groove 15th in the area of the indentations 11 , 12 , preferably in the bottom of the first indentation 11 runs. The holding element 16 stands between the two partial areas 13 , 14th the filter head sealing surface 5 in front. The holding element stands in particular 16 along a circular ring opposite the filter head sealing surface 5 in front.

The second indentation 12 extends at least over half, preferably more than two thirds of the width of the filter element side 8th , between inner surface 9 and exterior surface 10 . The first indentation 11 extends at least over half, here over two thirds of the width of the filter head side 7th between inner surface 9 and exterior surface 10 .

In a circumferential part of the second indentation 12 , which is preferably in the area of the lowest point of the second indentation 12 is, the sealing body is 4th not on the filter element sealing surface 6th at. As can be seen, the sealing body is located 4th in the area which is the filter head sealing surface 5 is closest.

As also from 3 and also from 4th shown are the retaining element 16 and the retaining groove 15th designed in such a way that between the reason of the in 4th shown retaining groove 15th and the area of the holding element 16 , which of the filter element sealing surface 6th is closest, there is a tight fit. This is achieved by reducing the depth of the retaining groove 15th the seal when the sealing body is not installed 4th at least as large as the height of the holding element 16 in the direction of the central axis 18th , preferably smaller than the height of the holding element 16 is.

It is also shown that the locking connection 17th by unilateral expansion 19th on the holding element 16 and a corresponding recess 20th in the sealing body 4th is formed. The extension 19th stands in the radial direction to an in 1 shown central axis 18th of the sealing body 4th outwards. The opposite side of the retaining element 16 has no bulge and is in the direction of the central axis 18th just. The holding element 16 is essentially L-shaped, which is shown in 3 is shown mirror-inverted.

The sealing body shown 4th also has a hardness between 60 Shore A and 80 Shore A, preferably 70 Shore A.

In 4th it is shown that the faces 13 , 14th the filter head sealing surface 5 and the filter element sealing surface 6th in radial direction to the central axis 18th are at an internal angle α smaller than 180 °, preferably between 130 ° and 170 ° to each other. Next is the filter head side 7th of the sealing body 4th two circular circumferential sealing partial surfaces 23 , 24 on, between which the retaining groove 15th in the sealing body 4th extends. Both sealing faces 23 , 24 point in the radial direction to the central axis 18th an outer angle α ₁ smaller than 180 °, preferably between 125 ° and 175 ° to each other.

Because the sealing body 4th in 4th is shown in the compressed state, it is obvious that the second indentation 12 in the direction of the central axis 18th in the unmounted state has a greater depth than the partial surfaces 13 , 14th , to the middle between the two faces 13 , 14th towards the filter head 3 extend. For example, a pressing of the sealing body is shown 4th achieved when the height of the faces 13 , 14th less than 70% of the depth of the second indentation 12 amounts.

As from the force distribution and the exposed inner and outer surface 9 , 10 is recognizable, it is the sealing body 4th an axially acting seal, which essentially only seals through axially acting forces.

In 5 is a corresponding filter element 2 shown, which is shown here as a filter cartridge. The filter element 2 has a filter element sealing surface 6th on that to one end face 21st of the filter element 2 is set back. The face is described differently 21st by one opposite the filter element sealing surface 6th protruding all-round collar 22nd educated.

With the filter element shown 2 , it is a replaceable filter element 2 , which can be used to separate particles and / or gases and / or liquids. In particular, it is a filter cartridge that can be designed for use in a filter, in particular a compressed air filter. The filter may be equipped with several filter stages.

The filter element shown 2 comprises a substantially tubular body 27 , with an annular face 21st that one, among other things, in 1 and 7th shown, filter head 3 is facing. Next, the filter element 2 one from the front 21st spaced bottom 28 on that of the filter head 3 is turned away. In addition, the filter element 2 a peripheral surface 29 on, extending along a central axis 18th , in particular an axis of rotation, extends. As can be seen, the peripheral surface connects 29 the front 21st and the bottom 28 together. Next are in the area of the front 21st several, preferably three, particularly preferably four, radially to the central axis 18th running holding arms 30th shown. At the front 21st is an annular filter element sealing surface 6th available. The holding arms 30th are opposite the filter element sealing surface 6th and / or opposite the end face 21st in front.

The holding arms 30th are essentially L-shaped. The holding arms are also available 30th opposite the filter element sealing surface 6th and / or the end face 21st in the axial direction and in the radial direction outwards, the retaining arms 30th from the peripheral surface 29 protrude radially outward.

How out 5 Also evident are the retaining arms 30th firmly to the filter element sealing surface 6th connected, preferably in one piece with the filter element sealing surface 6th educated.

It is also shown that the holding arms 30th one support surface each 47 have in the opposite direction of the filter element sealing surface 6th shows. The support surface 47 is convex. The convex curvature of the support surfaces 47 runs in the axial direction to the central axis 18th , the support surfaces 47 to the free ends of the holding arms 30th , preferably on the end faces 49 connect and have a length of at least 2 millimeters and a maximum of 8 millimeters in the radial direction. A length between 3 and 6 millimeters is particularly advantageous. Such a dimensioning allows the filter element to be easily removed 2 and at the same time offers a sufficient support surface 47 as an abutment to the reception facilities 36 .

The holding arms 30th have an end face 49 on, which is at the exposed end of the support arms 30th located in the radial direction of the peripheral surface 29 , and thus from the central axis 18th , points away. The distance between the center of the filter element sealing surface is here 6th and an end face 49 in radial direction to the central axis 18th between 12 and 18 millimeters. A distance between the end faces is particularly advantageous 49 to the center of the filter element sealing surface 6th between 14 and 16 millimeters. The distance between the filter element sealing surface 6th and the beginning of the support surfaces 47 in the axial direction is between 0 and 4 millimeters, preferably between 1 and 2 millimeters.

The filter element 2 is designed so that on the filter element sealing surface 6th essentially only axial forces act. The holding arms 30th form an abutment 50 against the axial forces caused by the compression of the in 1 sealing body shown 4th arise on the filter element sealing surface 6th is applied.

It is of particular advantage that the holding arms 30th are flexible in the axial direction and thus a compensating element between the one on the filter element sealing surface 6th adjacent sealing body 4th and in 6th shown receiving devices 36 form. The reception facilities 36 take the holding arms 30th on.

The filter element 2 has centering ramps 48 at the transition between the holding arms 30th and the peripheral surface 29 at an angle between 70 ° and 5 ° to the central axis 18th have and from the peripheral surface 29 towards the support arms 30th go off. It when the angle between the circumferential surface is particularly advantageous 29 and the centering ramps 48 is between 20 ° and 40 °. The centering ramps 48 connect the peripheral surface 29 and the support surfaces 47 with each other, the centering ramps 48 the centering of the filter element 2 in the surrounding filter sleeve 33 to serve.

6th shows a substantially tubular filter sleeve 33 with a filter element 2 , the filter sleeve 33 one to the filter head 3 facing open filter sleeve face 34 and a filter sleeve outside running along the jacket surface 35 having. The filter sleeve 33 surrounds the filter element 2 and delimits the interior of the filter from the environment. The filter sleeve face 34 has reception facilities 36 for the holding arms 30th on, the filter element 2 only about those in the reception facilities 36 arranged holding arms 30th with the filter sleeve 33 is in contact and otherwise floating freely in the filter sleeve 33 hangs.

The reception facilities 36 are at least through continuous axial cuts 38 formed on the filter sleeve face 34 begin and radial to the central axis 18th run, with the receiving facilities 36 the holding arms 30th record, tape. The ends of the incisions 38 form abutments 50 that match the convex support surfaces 47 the holding arms 30th are concave, the abutment 50 absorb the compression force caused by the compression of the sealing body 4th arises.

Two of the reception facilities 36 are used as pick-up locking devices 51 designed to accommodate the holding arms 30th and the inclusion of in 8th shown retaining bolt 37 to serve. The retaining bolts 37 are on the filter head 3 attached and radial to the central axis 18th aligned. The receptacle locking devices 51 are designed in such a way that the retaining bolts 37 in the manner of a bayonet lock with the receiving locking devices 51 work together.

The receptacle locking devices 51 point in addition to the axial incisions 38 a Fastening extension 39 on, with the attachment extension 39 is formed by a further incision, which is formed by the axial incisions 38 goes off and essentially in the circumferential direction around parts of the filter sleeve 33 runs. The attachment extension 39 further has a snap-in undercut 40 through an indentation on the filter head side in the end area of the attachment extension 39 is formed.

In 7th is a filter head 3 Shown from the bottom, with the filter sleeve 33 and the filter element 2 are not shown. The filter head 3 has a filter head sealing surface 5 on which of the in 1 to 3 Sealing body shown 4th is applied. As can be seen from the drawing, there are retaining arm recesses 41 provided opposite the filter head sealing surface 5 are set back, with the retaining arms 30th in the mounted state in the retaining arm recesses 41 extend.

The filter head continues 3 a hollow cylindrical filter sleeve face recess 42 that extends from the filter head sealing surface 5 off and essentially axially symmetrical to the central axis 18th in the filter head 3 extends and in the assembled state the filter sleeve face 34 receives, wherein the filter sleeve face recess 42 in radial direction to the central axis 18th outside the filter head sealing surface 5 is located.

The filter head 3 also has two, to the central axis 18th radial retaining bolt holes 43 on, which are preferably opposite each other, the retaining bolt holes 43 Retaining bolt 37 record, preferably in the manner of a bayonet lock with the receiving devices 36 in the filter sleeve 33 out 6th cooperate, preferably with between the retaining bolts 37 and the filter head 3 a metal-to-metal cone seal 44 is provided.

In 8th is a multi-stage filter 45 shown with several filter stages, the filter stages additionally or as an alternative to the sealing arrangement 1 and / or the filter element 2 Include previously described features. This includes the multi-stage filter 45 including filter elements 2 with different filter properties.

In such a multi-stage filter 45 can use the sealing arrangements 1 for sealing between the filter elements 2 and the filter heads 3 and / or the reception facilities 36 the filter sleeves 33 and / or the holding arms 30th the filter elements 2 be designed in accordance with the above features essentially identical to one another. In addition, at least one of the filter elements 2 from the outside with higher pressure than from the inside, with at least one of the filter elements 2 vice versa is pressurized.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2007/0095744 A1 [0004]

Claims (14)

Filter element (2), in particular exchangeable filter element, in particular for separating particles and / or gases and / or liquids, in particular a filter cartridge, for use in a filter, in particular a compressed air filter, in particular as part of a filter 45 with several filter stages, comprising an im Essentially tubular body (27) with an annular end face (21) facing a filter head (3), an underside (28) spaced from the end face (21) and facing away from the filter head (3), a peripheral surface (29) ), which extends along a central axis (18), in particular an axis of rotation, - the circumferential surface (29) connecting the end face (21) and the underside (28) with one another, - with several, preferably four holding arms (30) extending radially to the central axis (18) are provided, with an annular, in particular circular, filter element sealing surface on the end face (21) (6) is provided, characterized in that the holding arms (30) protrude with respect to the filter element sealing surface (6). Filter element (2) Claim 1 , characterized in that the holding arms (30) are essentially L-shaped and / or that the holding arms (30) protrude outwards in the axial direction and / or in the radial direction with respect to the filter element sealing surface (6) and / or that the holding arms (30 ) protrude radially outward on the peripheral surface (29). Filter element (2) according to one of the preceding claims, characterized in that the holding arms (30) are firmly connected to the filter element sealing surface (6), preferably in one piece with the filter element sealing surface (6). Filter element (2) according to one of the preceding claims, characterized in that the holding arms (30) each have a support surface (47) which points in the opposite direction of the filter element sealing surface (6), preferably wherein the support surface (47) is convexly curved and / or the distance between the filter element sealing surface (6) and the support surfaces (47) in the axial direction is between 0 and 4 millimeters, preferably between 1 and 2 millimeters. Filter element (2) according to one of the preceding claims, characterized in that the holding arms (30) each have an end surface (49) which is located at the exposed end of the respective holding arm (30) which is radially separated from the circumferential surface (29) points away, preferably the distance between the center of the filter element sealing surface (6) and the end surface (49) in the radial direction being between 12 and 18 millimeters, preferably the distance to the center of the filter element sealing surface (6) being between 14 and 16 millimeters. Filter element (2) according to one of the preceding claims, characterized in that the filter element (2) is designed in such a way that essentially only axial forces act on the filter element sealing surface (6), preferably with the holding arms (30) having an abutment (50) opposite the Form axial forces, preferably with the axial forces arising from the compression of the sealing body (4), which rests on the filter element sealing surface (6), preferably with the holding arms (30) being flexible in the axial direction and as a compensation element between the sealing body resting on the filter element sealing surface (6) (4) and receiving devices (36) which receive the retaining arms (30). Filter (45) with at least one filter head (3), a filter sleeve (33) and a filter element (2), with a sealing body (4) also being provided which rests against the annular filter element sealing surface (6) of the filter element (2) that the sealing body (4) has an outer space (31), which is located outside the filter element (2) and inside the filter sleeve (33), from an inner space (32) located inside the filter element (2), between the filter head (3) and filter element (2) separated from each other. Filter (45) Claim 7 , characterized in that the filter sleeve (33) is essentially tubular and is provided with an open filter sleeve end face (34) facing the filter head (3) and a filter sleeve outer side (35) running along the jacket surface, preferably with the filter sleeve (33) being the filter element (2) surrounds and delimits it from the surroundings, preferably with the filter sleeve end face (34) having receiving devices (36) for the holding arms (30), preferably with the filter element (2) only via the holding arms (30) arranged in the receiving devices (36) is in contact with the filter sleeve (33) and otherwise hangs freely floating in the filter sleeve (33). Filter (45) Claim 7 or 8th , characterized in that the receiving devices (36) are formed at least by continuous incisions (38) which begin at the filter sleeve end face (34) and run radially to the central axis (18), preferably the receiving devices (36) receiving the holding arms (30) , preferably with the ends of the incisions (38) forming abutments (50) which are convexly shaped to match concave support surfaces (47), preferably with the abutments (50) absorbing the pressing force that results from the pressing of the sealing body (4). Filter (45) for one of the Claims 7 to 9 , characterized in that the sealing body (4) is an axially acting seal, preferably wherein the filter sleeve (33) seals against the filter head (3) by means of a radial seal (46). Filter (45) for one of the Claims 7 to 10 characterized in that at least two of the receiving devices (36) are designed as receiving locking devices (51), which are used to receive the holding arms (30) and to receive retaining bolts (37), which are preferably attached to the filter head (3) and / or radially to the Center axis (18) are aligned, preferably wherein the receiving locking devices (51) are designed such that the retaining bolts (37) interact in the manner of a bayonet lock with the receiving locking devices (51). Filter (45) for one of the Claims 7 to 11 characterized in that the receiving locking device (51) has, in addition to the axial incisions (38), a fastening extension (39), preferably wherein the fastening extension (39) is formed by a further incision which extends from the axial incisions (38) and essentially runs in the circumferential direction around parts of the filter sleeve (33), preferably the fastening extension (39) having a snap-in undercut (40) which is formed by an indentation on the filter head side in the end region of the fastening extension (39). Filter (45) for one of the Claims 7 to 12 , characterized in that a sealing arrangement (1) is provided for fluid-tight sealing between the filter head (3) and the filter element (2), - the sealing arrangement (1) having a filter head sealing surface in addition to the sealing body (4) and the filter element sealing surface (6) (5) comprises, - wherein the annular, elastic sealing body (4) has a filter head side (7) facing the filter head sealing surface (5), an opposite filter element side (8) facing the filter element sealing surface (6), and a circumferential on the inside Inner surface (9) and an opposite outer surface (10) running around the jacket surface, - the filter head sealing surface (5) and the filter element sealing surface (6) consisting of at least one circumferential inner partial surface (13) and one circumferential outer partial surface (14) , wherein the sealing arrangement (1) is designed such that the sealing body (4), when pressure is applied, from the inner surface (9) and / or the Au ßenfläche (10) from, in the direction of the acting force, wedged between the inner partial surfaces (13) and / or the outer partial surfaces (14). Filter (45) for one of the Claims 7 to 13 , characterized in that at least two filter stages, each with a filter head (3), a filter sleeve (33) and a filter element (2) are provided, preferably wherein the sealing arrangements (1) for sealing between the filter elements (2) and filter heads (3) , the receiving devices (36) of the filter sleeves (33) and the holding arms (30) of the filter elements (2) of the at least two filters are designed essentially identically.

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